Transmit Power Control for Wireless Security

1. An apparatus for wireless communication, the apparatus comprising: a memory; and a processor coupled to the memory, wherein the processor is configured to: detect a wireless device based, at least in part, on reception of a transmission from the wireless device, the transmission occurring at a normal-power level; exchange, in response to at least the detection of the wireless device, one or more encryption keys with the wireless device at a low-power level; initiate an encrypted session with the wireless device at the normal-power level using the one or more encryption keys exchanged at the low-power level; and communicate with the wireless device in the encrypted session after the initiation is successful, wherein some transmissions in the encrypted session are transmitted at the low-power level and some other transmissions in the encrypted session are transmitted at the normal-power level, wherein power level of each transmission in the encrypted session is selected based on whether data to be transmitted is confidential information.

2. The apparatus of claim 1 , wherein the processor is further configured to provide an indication of detection of the wireless device to a user.

3. The apparatus of claim 1 , wherein the processor is further configured to prompt, in response to at least the detection of the wireless device, a user for authorization to communicate with the wireless device.

4. The apparatus of claim 3 , wherein the processor is further configured to receive an input from a user authorizing communication with the wireless device and wherein exchanging is in response to at least receiving the input.

5. The apparatus of claim 1 , wherein the one or more encryption keys are Data Encryption Standard (DES) keys.

6. The apparatus of claim 1 , wherein the one or more encryption keys are Advanced Encryption Standard (AES) keys.

7. The apparatus of claim 1 , wherein initiating the encrypted session comprises transmitting or receiving an unencrypted message.

8. A method, implemented in an apparatus, for wireless communication, the method comprising: detecting a wireless device based, at least in part, on reception of a transmission from the wireless device, the transmission occurring at a normal-power level; exchanging, in response to at least the detection of the wireless device, one or more encryption keys with the wireless device at a low-power level; initiating an encrypted session with the wireless device at the normal-power level using the one or more encryption keys exchanged at the low-power level; and communicate with the wireless device in the encrypted session after the initiation is successful, wherein some transmissions in the encrypted session are transmitted at the low-power level and some other transmissions in the encrypted session are transmitted at the normal-power level, wherein power level of each transmission in the encrypted session is selected based on whether data to be transmitted is confidential information.

9. The method of claim 8 , further comprising providing an indication of detection of the wireless device to a user.

10. The method of claim 8 , further comprising prompting, in response to at least the detection, a user for authorization to communicate with the wireless device.

11. The method of claim 10 , further comprising receiving an input from a user authorizing communication with the wireless device, wherein exchanging is in response to at least receiving the input.

12. The method of claim 8 , wherein the one or more encryption keys are Data Encryption Standard (DES) keys.

13. The method of claim 8 , wherein the one or more encryption keys are Advanced Encryption Standard (AES) keys.

14. The method of claim 8 , wherein initiating the encrypted session comprises transmitting or receiving an unencrypted message.

15. A cellular telephone, the cellular telephone comprising: a memory; an antenna; and a processor coupled to the memory and the antenna, wherein the processor is configured to: detect a wireless device based, at least in part, on the reception, via the antenna, of a transmission from the wireless device, the transmission occurring at a normal-power level; exchange, via the antenna and in response to at least the detection of the wireless device, one or more encryption keys with the wireless device at a low-power level; initiate, via the antenna, an encrypted session with the wireless device at the normal-power level using the one or more encryption keys exchanged at the low-power level; and communicate with the wireless device in the encrypted session after the initiation is successful, wherein some transmissions in the encrypted session are transmitted at the low-power level and some other transmissions in the encrypted session are transmitted at the normal-power level, wherein power level of each transmission in the encrypted session is selected based on whether data to be transmitted is confidential information.

16. A non-transitory computer-readable medium having stored thereon, computer executable instructions that, when executed by an apparatus, cause the apparatus to perform a method comprising: detecting a wireless device based, at least in part, on reception of a transmission from the wireless device, the transmission occurring at a normal-power level; exchanging, in response to at least the detection of the wireless device one or more encryption keys with the wireless device at a low-power level; initiating an encrypted session with the wireless device at the normal-power level using the one or more encryption keys exchanged at the low-power level; and communicating with the wireless device in the encrypted session after the initiation is successful, wherein some transmissions in the encrypted session are transmitted at the low-power level and some other transmissions in the encrypted session are transmitted at the normal-power level, wherein power level of each transmission in the encrypted session is selected based on whether data to be transmitted is confidential information.